drm_gralloc: Add support for Rockchip DRM

This patch adds backend for libdrm_rockchip to support drm_gralloc on
systems with Rockchip DRM.

Change-Id: Iedcf1cb25cc2462681f0355f939018037171d207
Signed-off-by: Tomasz Figa <tfiga@google.com>
diff --git a/gralloc_drm.cpp b/gralloc_drm.cpp
index ebff717..6f90a84 100644
--- a/gralloc_drm.cpp
+++ b/gralloc_drm.cpp
@@ -79,6 +79,10 @@
 		if (!drv && !strcmp(version->name, "radeon"))
 			drv = gralloc_drm_drv_create_for_radeon(fd);
 #endif
+#ifdef ENABLE_ROCKCHIP
+		if (!drv && !strcmp(version->name, "rockchip"))
+			drv = gralloc_drm_drv_create_for_rockchip(fd);
+#endif
 #ifdef ENABLE_NOUVEAU
 		if (!drv && !strcmp(version->name, "nouveau"))
 			drv = gralloc_drm_drv_create_for_nouveau(fd);